Normy

Obsah

ČSN P CEN/TS 17977 (38 6475) This document defines the quality of gaseous hydrogen, i.e. its parameters and limiting values, to be transmitted, injected into and extracted from storages, distributed and utilized in fully and/or partially rededicated gas infrastructure and connected applications in a safe way. This document gives evidence to the end-user which minimum exit hydrogen quality can be expected and ensured from natural gas infrastructure as minimum requirement and without further purification. NOTE 1 - The rededicated gas infrastructure can include new parts of this infrastructure constructed/added after the conversion of the natural gas grid. NOTE 2 - It is expected that over time the hydrogen delivered through such pipework will improve in quality, e.g. due to the increase in share of high purity hydrogen produced by electrolysis. This will be taken into account in further development of this document.

Obsah

ČSN P CEN/TS 15656 This Technical Specification specifies a molybdovanadate spectrophotometric method for the determination of phosphorus in copper and copper alloys in the form of castings or unwrought or wrought products. The method is applicable to products having phosphorus mass fractions between 0,001 % and 0,5 %.

Obsah

ČSN ISO 19662 Tento dokument specifikuje metodu acidobutyrometrickou neboli "Gerberovu" pro stanovení obsahu tuku v mléce. Je použitelný pro plnotučné a částečně odstředěné mléko. Je rovněž použitelný pro mléko obsahující povolené konzervační látky (dichroman draselný, bronopol). Nevztahuje se na "formalínové" mléko ani na mléka, která byla ošetřena homogenizací.

Obsah

ČSN EN ISO 1172 This document specifies two calcination methods for the determination of the textile glass and mineral filler content of glass-reinforced plastics: - Method A: for the determination of the textile glass content when no mineral fillers are present. - Method B: for the determination of the textile-glass and mineral-filler content when both components are present. This document is applicable to the following types of material: - prepregs made from yarns, rovings, tapes or fabrics; - SMC, BMC and DMC moulding compounds; - textile-glass-reinforced thermoplastic moulding materials and granules; - filled or unfilled textile-glass laminates made with thermosetting or thermoplastic resins. The methods do not apply to the following types of reinforced plastic: - those containing reinforcements other than textile glass; - those containing materials which do not completely burn off at the test temperature (for example, those based on silicone resin); - those containing mineral fillers which degrade at temperatures below the minimum calcination temperature.

Obsah

ČSN EN ISO 8130-16 This document specifies a method for determining the density of coating powders by liquid displacement in a measuring cylinder. The method is based on a determination of the mass and the volume of a test portion. It can be used for all types of coating powders. NOTE - If the powder does not swell in contact with the displacement liquid used and if the displacement liquid replaces the air between the powder particles, it can then be used and compared with the method described in ISO 8130-3.

Obsah

ČSN EN ISO 22553-16 This document specifies a test method for determining the pigment-binder ratio. It applies to electro-deposition coatings for automotive industries and other general industrial applications, e.g. chiller units, consumer products, radiators, aerospace, agriculture.

Obsah

ČSN EN ISO 22553-15 This document specifies a test method for estimating the influence of jetting liquids from the rinsing process after electro-deposition coating (permeate residues) on a coating. It applies to electro-deposition coatings for automotive industries and other general industrial applications, e.g. chiller units, consumer products, radiators, aerospace, agriculture.

Obsah

ČSN EN 12390-13 (73 1302) Tato dokument specifikuje zkušební metodu stanovení sečnového modulu pružnosti v tlaku u ztvrdlého betonu na zkušebních tělesech, která mohou být vyrobena nebo odebrána z konstrukce. Zkušební metoda umožňuje stanovení dvou sečných modulů pružnosti: počáteční modul, EC,0, který se měří při prvním zatížení a stabilizovaný modul, EC,S, který se měří po třech zatěžovacích cyklech. Jsou uvedeny dvě různé zkušební metody. První z nich (metoda A) slouží pro stanovení obou modulů - počátečního i stabilizovaného, druhá (metoda B) slouží pouze pro stanovení stabilizovaného modulu.

Obsah

ČSN EN ISO 5978 This document specifies a method for the determination of the resistance of rubber- or plastics-coated fabric sheets to blocking when left in contact for specified temperature, time and pressure.

Obsah

ČSN EN ISO 24395 This document establishes a system for classifying the location and depth of human tooth restorations preparations.

Obsah

ČSN EN ISO 4033 This document specifies the characteristics of hexagon high nuts (style 2), in steel and stainless steel, with metric coarse pitch thread M5 to M39, and with product grades A and B. If in certain cases other specifications are requested, property classes and stainless steel grades can be selected from ISO 898-2 or ISO 3506-2.

Obsah

ČSN EN ISO 8674 This document specifies the characteristics of hexagon high nuts (style 2), in steel and stainless steel, with metric fine pitch thread 8 mm to 39 mm, and with product grades A and B. If in certain cases other specifications are requested, property classes and stainless steel grades can be selected from ISO 898-2 or ISO 3506-2.